What influences news bias?

What has an influence on the news we read and/or see? Why do we see the manifestations of bias as discussed in the previous section? There are four main influences that cause bias to apper in the news, and these are geography, ideology, institutional affiliations, and the nature of the medium. While all these influences do not necessarily affect every piece, most reporting is affected by at least one or two of these influences.

Getting information from the web
Not all mediums of information are equal. Some mediums present information ready to digest, while with other mediums one must be more careful while digesting information.

Taken from http://www.unitedmedia.com/wash/pcnpixel/archive/pcnpixel-20030325.html, ©2003 Thach Bui, reproduced for educational purposes only.